How many children have mobile phones?

Research says 10% of children talk on their mobiles for more than 45 minutes every day.

(Newsround)

As part of the latest study, the trust surveyed more than 17,000 schoolchildren aged seven to 16.

It found that 85.5 per cent of pupils had their own mobile phone, compared with 72.6 per cent who had their own books. Among children in Key Stage 2 – aged seven to 11 – 79.1 per cent had a mobile compared with 72.7 per cent who had access to books.